 /*******************************************************************************
  * Copyright (c) 2006, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.core.databinding.observable.set;

 import java.util.Set ;

 /**
  * @since 1.0
  *
  */
 public abstract class SetDiff {
     
     /**
      * @return the set of added elements
      */
     public abstract Set getAdditions();
     
     /**
      * @return the set of removed elements
      */
     public abstract Set getRemovals();
     
     /**
      * @see java.lang.Object#toString()
      */
     public String toString() {
         StringBuffer buffer = new StringBuffer ();
         buffer
             .append(getClass().getName())
             .append("{additions [") //$NON-NLS-1$
 .append(getAdditions() != null ? getAdditions().toString() : "null") //$NON-NLS-1$
 .append("], removals [") //$NON-NLS-1$
 .append(getRemovals() != null ? getRemovals().toString() : "null") //$NON-NLS-1$
 .append("]}"); //$NON-NLS-1$

         return buffer.toString();
     }
 }

